Impedance in a sentence

Complex impedance A graphical representation of the complex impedance plane Impedance is represented as a complex quantity and the term complex impedance may be used interchangeably.

A surge of energy on a finite transmission line will see an impedance of Z 0 prior to any reflections arriving, hence surge impedance is an alternative name for characteristic impedance.

At the resonant frequency, by definition, that impedance is a pure resistance which matches the characteristic impedance of the transmission line and the output (or input) impedance of the transmitter (or receiver).

Bilateral amplifier input impedance depends on the load, and output impedance on the signal source impedance.

Each antenna is alternately connected to a transmitter having a particular source impedance, and a receiver having the same input impedance (the impedance may differ between the two antennas).

Impedance matching is achieved when the source impedance is the complex conjugate of the load impedance.

In humans, the middle ear works as an impedance equaliser between the outside air's low impedance and the cochlear fluid's high impedance.

In humans, the middle ear works as an impedance equalizer between the outside air's low impedance and the cochlear fluid's high impedance.

Such hybrids also had their windings so arranged as to act as an impedance matching transformer, matching the low-impedance carbon button transmitter to the higher impedance parts of the system.

A transmission line of finite length (lossless or lossy) that is terminated at one end with an impedance equal to the characteristic impedance appears to the source like an infinitely long transmission line and produces no reflections.

For coax of common impedance this mode is effectively suppressed but in high impedance coax and on a single central conductor without any outer shield, low attenuation and very broadband propagation is supported.

High input impedance at the input terminals and low output impedance at the output terminal(s) are particularly useful features of an op-amp.

If there is a step increase in the impedance, then the reflection will have the same sign as the incident signal; if there is a step decrease in impedance, the reflection will have the opposite sign.

Impedance matching is important when components of an electric circuit are connected (waveguide to antenna for example): The impedance ratio determines how much of the wave is transmitted forward and how much is reflected.

In configurations with a voltage-sensing negative feedback, the output impedance of the amplifier is effectively lowered; thus, in linear applications, op-amp circuits usually exhibit a very low output impedance indeed.

In metallic lines, they may be supported by impedance mismatches between the source or load and the characteristic impedance of the transmission medium.

Input impedance The input stage with Q1 and Q3 is similar to an emitter-coupled pair (long-tailed pair), with Q2 and Q4 adding some degenerating impedance.

Measurements of impedance may be carried out at one frequency, or the variation of device impedance over a range of frequencies may be of interest.

Modeling Electrical model A quartz crystal can be modeled as an electrical network with a low- impedance (series) and a high- impedance (parallel) resonance points spaced closely together.

Proper network operation depends on constant characteristic impedance in all cables and connectors, with no impedance discontinuities in the entire cable system.